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Inherited Cataracts: Molecular Genetics, Clinical Features, Disease Mechanisms and Novel Therapeutic Approaches

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Inherited Cataracts: Molecular Genetics, Clinical Features, Disease Mechanisms and Novel Therapeutic Approaches Review Br J Ophthalmol: first published as 10.1136/bjophthalmol-2019-315282 on 25 March 2020. Downloaded from Inherited cataracts: molecular genetics, clinical features, disease mechanisms and novel therapeutic approaches Vanita Berry ,1 Michalis Georgiou ,1,2 Kaoru Fujinami,1,3 Roy Quinlan,1,4 Anthony Moore,2,5 Michel Michaelides1,2 1Department of Genetics, UCL ABSTRact lamellar, coralliform, blue dot (cerulean), cortical, Institute of Ophthalmology, Cataract is the most common cause of blindness in the pulverulent and polymorphic.9–11 The majority of University College London, the inherited cataracts are autosomal dominant London, UK world; during infancy and early childhood, it frequently 2Moorfields Eye Hospital NHS results in visual impairment. Congenital cataracts are with complete penetrance, but variable expres- Foundation Trust, London, UK phenotypically and genotypically heterogeneous and sion, autosomal recessive and X- linked inheritance 3National Institute of Sensory can occur in isolation or in association with other patterns are less frequent. Organs, National Hospital systemic disorders. Significant progress has been made Over the last 10 years, enormous progress has Organization, Tokyo Medical Centre, Tokyo, Japan in identifying the molecular genetic basis of cataract; been made in elucidating the molecular basis of 4Department of Biosciences, 115 genes to date have been found to be associated congenital cataract, with causative mutations iden- School of Biological and Medical with syndromic and non-syndromic cataract and 38 tified in genes encoding many different proteins Sciences, University of Durham, disease-causing genes have been identified to date to including intracellular lens proteins (crystallins), Durham, UK 5 membrane gap junction proteins (connexins), Ophthalmology Department, be associated with isolated cataract. In this review, we University of California School briefly discuss lens development and cataractogenesis, water channel proteins (aquaporins), cytoskeletal of Medicine, San Francisco, detail the variable cataract phenotypes and molecular proteins (eg, BFSP1 (filensin), BFSP2 (phakinin) California, USA mechanisms, including genotype–phenotype correlations, and vimentin) and transcription factors (TFs) (eg, and explore future novel therapeutic avenues including FOXE3, PAX6, PITX3 and MAFA) (table 1). Recent Correspondence to cellular therapies and pharmacological treatments. advances in molecular genetics, particularly next- Dr Vanita Berry, UCL Institute generation sequencing, has improved molecular of Ophthalmology, University 12 College London, 11-43 Bath diagnosis in the clinic. Street, London EC1V 9EL, UK; v. berry@ ucl. ac. uk and INTRODUCTION Prof. Michel Michaelides, UCL Cataract is the most common, but treatable cause LENS EMBRYOLOGY AND MORPHOLOGY Institute of Ophthalmology, of blindness in the world. Recently, during the 70th The ocular lens is a unique model to understand University College London, 11- World Health Assembly (October 2019), WHO esti- the important aspects of embryonic development, 43 Bath Street, London, EC1V mated that 2.2 billion people are visually impaired signalling, induction, cell differentiation, cell phys- 9EL, United Kingdom; michel. michaelides@ ucl. ac. uk around the world, out of which 65.2 million iology, biochemistry, organelle degradation and http://bjo.bmj.com/ people are affected with cataract (https://www. cellular longevity. Several reviews can provide a Received 25 September 2019 who. int/ publications- detail/ world- report- on- detailed description.6 13 14 Revised 20 November 2019 vision). Congenital cataracts are detected at birth During gastrulation (day 22, Carnegie stage 9 in Accepted 28 January 2020 or during the first decade of life. WHO estimated human development), a single eye field forms in that >14 million children are bilaterally blind from the middle of the anterior neural plate, which sepa- cataract, representing >50% of all causes of blind- rates into two optic vesicles and further induce the 1 ness globally. Congenital cataracts are present in nearby surface ectoderm to form the lens placode on September 29, 2021 by guest. Protected copyright. 1–6/10 000 live- births in developed countries and (a precursor of the lens) by day 28 (Carnegie stages 5–15/10 000 births in developing countries. They 12–13) (figure 1A,B). At this stage, a series of induc- are a prominent cause of vision loss in infants and tive interactions begin to shape the eye, orchestrated children.2 3 Most vision loss is due to amblyopia, by signalling molecules such as bone morphogenetic but some are due to postoperative complications proteins and fibroblastic growth factor 2, as well such as glaucoma and retinal detachment. as TFs such as OTX2, PAX6 and PITX3.15 This Approximately half of the congenital cataracts programme can be mimicked in culture conditions are characterised as inherited and are a clinical to determine the differentiation pathway of plurip- feature of nearly 200 syndromic genetic diseases,4 otent cells and their derivatives.16 including for instance diabetes and cholesterol The lens placode invaginates to form the lens © Author(s) (or their metabolism diseases. Congenital cataract was the pit (figure 1C), which makes a complete circle of employer(s)) 2020. Re- use permitted under CC BY. first autosomal disease to be genetically mapped in cells and detaches from the surface ectoderm to 5 Published by BMJ. humans and has subsequently been shown to be develop into the lens vesicle (figure 1D). By the associated with considerable genetic and pheno- end of week 4 (Carnegie stages 10–13), the cells To cite: Berry V, Georgiou M, typic heterogeneity.6–8 Several distinct phenotypes from the posterior vesicle start elongating towards Fujinami K, et al. Br J Ophthalmol Epub ahead have been identified in families with autosomal- the anterior epithelial cell layer to become the of print: [please include Day dominant congenital cataract based mainly on the primary lens fibres that fill the lens vesicle and Month Year]. doi:10.1136/ location and appearance of the opacification in later become the embryonic nucleus of the mature bjophthalmol-2019-315282 the lens: anterior polar, posterior polar, nuclear, lens (figure 1E). The portion of the optic vesicle Berry V, et al. Br J Ophthalmol 2020;0:1–7. doi:10.1136/bjophthalmol-2019-315282 1 Review Br J Ophthalmol: first published as 10.1136/bjophthalmol-2019-315282 on 25 March 2020. Downloaded from Table 1 Genes implicated in inherited cataract Gene classification Gene Gene locus Inheritance Crystallins CRYAA 21q22.3 AD/AR CRYAB 11q22.1- q23.2 AD/AR CRYBA1 17q11.2- q12 AD/AR CRYBA2 2q34 AD CRYBA4 22q12.1 AD/AR CRYBB1 22q12.1 AD/AR CRYBB2 22q11.23 AD CRYBB3 22q11.23 AD/AR CRYGA 2q33q35 AD CRYGB 2q33q35 AD CRYGC 2q33q35 AD CRYGD 2q33q35 AD Figure 1 Schematic diagram of the developing lens. (A) The OV CRYGS 3q25- qter AD approaches the PLE at human age 4 weeks, embryo length 3–5 mm, Lens membrane protein GJA3 13q11- q12 AD/AR carnegie stage 12. (B) Contact between OV and PLE results in the LP GJA8 1q21.1 AD/AR formation at human age 4–5 weeks, embryo length 4–6 mm, carnegie MIP 12q13 AD/AR stage 13. (C) LP invagination produces a lens pit at Carnegie stage 14, TMEM114 16p13.2 AD week 5, 31–35 days. (D) Lens pit detaches from the surface ectoderm EPHA2 1p36 AD/AR and the LV is formed at human age 5–6 weeks, 7–9 mm embryo SLC16A12 10q23.13 COMPLEX length, carnegie stage 15, day 35–38. (E) Posterior lens vesicular cells LIM2 19q13.4 AR elongate toward the anterior epithelial cells to form PLFs. (F) The Developmental factors PAX6 11p13 AD embryonal nucleus is formed following the obliteration of the LV lumen PITX3 10q25 AD/AR at human age 6 weeks, 8–11 mm embryo length, carnegie stage 16. LP, FOXE3 1p32 AD/AR lens placode; LV, lens vesicle; OV, optic vesicle; PLE, presumptive lens MAF 16q22- q23 AD ectoderm; PLF, primary lens fibre. EYA1 8q13.3 AD VSX2 14q24.3 AR CataRact PHENOTYPES AND MODES OF INHERitaNCE HSF4 16q21 AD/AR The congenital cataract phenotype broadly reflects spatiotem- Cytoskeletal proteins BFSP1 20p11.23- p12.1 AD/AR poral insults experienced by the developing lens. Broadly these BFSP2 3q21- q22 AD/AR phenotypes can be divided into eight distinct clinical appear- VIM 10p13 AD/AR ances: (1) nuclear (figure 2A), (2) anterior polar (figure 2B), (3) NHS Xp22.13 XL posterior polar (figure 2C), (4) lamellar, (5) coralliform, (6) blue Genes with special roles in the lens TDRD7 9q22.33 AD dot (cerulean – figure 2D), (7) cortical (figure 2E) and (8) pulver- 9–11 CHMP4B 20q11.22 AD ulent (figure 2F). http://bjo.bmj.com/ WFS1 4p16.1 AD There is considerable phenotypic variation in autosomal cata- FYCO1 3p21.31 AR ract, although there have been few systematic studies recording 8 GCNT2 6p24.2 AR differences for specific mutations. To date (August 2019), 1314 novel and recurrent disease-cau sing sequence variants have FTL 19q13.33 AD been identified (http:// cat- map. wustl. edu/), with a well- defined AGK 7q34 AR As described in Cat- Map; an online chromosome map and reference database for inherited and age- related forms of cataract(s) in humans, mice and other on September 29, 2021 by guest. Protected copyright. vertebrates (https://cat-map.wustl.edu/). that faced the lens placode gives rise to the retina. The retina, in turn, provides inductive signals that regulate the growth and apical-posterior axis of the lens. In the early optic cup stage, the lens vesicle releases signals that induce the overlying surface ectoderm to differentiate into the corneal epithelium. Around weeks 6–7 (Carnegie stages 16-19), lens fibres start to develop from the epithelial cells located at the equator where they begin to elongate and differentiate into the secondary lens fibres (fetal nucleus) of the developing lens (figure 1F). Around week 8 (Carnegie stage 20), the Y-shaped suture appears at the anterior and posterior poles of the embryonic nucleus of the lens as a result of the terminal ends of the secondary lens fibres abutting each other.
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